D24 Diesel emision failure

I have just bought a 940 GLE 2.4 diesel estate 1995 year with 94,000 miles. The car failed its last two MOTs on emisions and I have found a note from a Volvo dealer stating compresion down on 3 cylinders "new engin advised". I am wondering whether there could be another explanation. There is no excessive crankcase pressure and the car starts fine but chucks out black smoke on hard acceleration. I am thinking of changing the injectors but am loathed to throw good money after bat. Has anyone had a similar problem. Any help/advice would be apreciated.

Thanks. David

Is there a great deal of oil in the turbo? It could be as simple as blown turbo seals.

1995 Volvo 945 LPT Auto

[Peter Milnes]

The Green Book gives the following reasons for excessive black smoke as 1) Injection Pump sucking in air via fuel line or pump drive shaft seal. 2) Injection timing incorrect. 3) Injection pump defective. 4) Hose between intake manifold and smoke limiter has vibrated loose or cracked. 5) Air filter blocked.

All the best, Peter.

He tells me the took the car back as the engine was dead.

1995 Volvo 945 LPT Auto

If he ever gets another 940 TD, tell him to have the EGR mod. done - simply remove the exhaust gas recirculating pipe and blank off either end, and there'll be no more black smoke. I got 250,000 smoke-free miles out of one this way, passed the MoT every time, absolutely no loss in performance or m.p.g. The exhaust gas recirculating pipe was intended for petrol engined cars [as a Volvo service manager explained to me] but Volvo had to be seen to be applying it across the range of course ...

Thank you all for your responses. I have returned the car but feel the problem was a blown head gasket, as advised by Peter. There was emulsion in the tube from the flame trap to the turbo and a vast quantity of oil in the air hoses both to and from the intercooler.

I am in the market for a good 940 diesel 7 seat estate is anyone has one for sale please drop me a line.

Thanks again for your help.

David

Decent selection on Autotrader at the mo (unusually), from £4K for a 95 M 78K auto estate (trade) down to average £2K for older higher mileage private sales, worth a look perhaps? www.autotrader.co.uk